Implement MojoGetBufferInformation(), part 3.

mojo/nacl/sfi/nacl_bindings_generator/interface_dsl.py

Index: mojo/nacl/sfi/nacl_bindings_generator/interface_dsl.py
diff --git a/mojo/nacl/sfi/nacl_bindings_generator/interface_dsl.py b/mojo/nacl/sfi/nacl_bindings_generator/interface_dsl.py
index 88607ff461c435eb0b6d6b8e2ec79d66bff53557..9b63197f45992e65469d77bcc4f4107185d8242e 100644
--- a/mojo/nacl/sfi/nacl_bindings_generator/interface_dsl.py
+++ b/mojo/nacl/sfi/nacl_bindings_generator/interface_dsl.py
@@ -119,6 +119,18 @@ class Param(object):
     self.is_output = True
     return self
 
+  # Out extensible structs have an input size indicating the buffer size. On

[viettrungluu, 2016/03/09 00:51:04]

This (and the resulting generated code) should be considered carefully. I think
it's right....

[Sean Klein, 2016/03/09 22:18:22]

Seems correct to me. Slightly confusing that it is identified as "not an array"
here, but uses the "ConvertArray" function later (I understand why, but it's
still a little weird).

+  # success, the size actually written is indicated in the struct.
+  def OutExtensibleStruct(self, ty, size):
+    self.base_type = ty
+    self.param_type = 'struct ' + ty + '*'
+    self.size = size
+    self.is_array = False
+    self.is_output = True
+    self.is_struct = True
+    self.is_extensible = True
+    return self
+
   # The size of the struct is fixed by the API, it cannot be extended.
   def OutFixedStruct(self, ty):
     self.base_type = ty